Tonight I had the Kerzel running quite elegantly with the larger carburetor on it, and the Kerzel lever removed. I was afraid that the carburetor might be too large for a 3/4" diameter single cylinder engine. As the barrel of the carburetor gets larger, the air flowing thru it slows down, and consequently doesn't create as much of a low pressure area (Venturi effect) in the area where the spray bar for the gasoline pokes into the air stream. Since the low pressure area becomes less, it won't lift gasoline from the tank nearly as well, and the engine starves for fuel. It is very cold outside, and I don't want to gas myself, so I didn't have the engine running for very long. It does seem to be working all right with the larger carb, and is responsive to the opening/closing of the throttle. I will do more testing as time allows, out in my main garage. Once I am convinced that the engine is okay with this larger carb, I will try out the hit and miss function again.
